Nipkow disk and boiler: what they have in common

1. Step 1. Nipkow disk — uses — Persistence of vision. The lines merge into a frame thanks to persistence of vision.
2. Step 2. Persistence of vision — is used in — Cinema. The illusion of motion.
3. Step 3. Cinema — uses — Cinématographe. Cinema began with the cinématographe.
4. Step 4. Cinématographe — has part — Crank. The film was advanced by turning a handle.
5. Step 5. Crank — is part of — Watt steam engine. The stroke of the piston becomes rotation of a shaft (Watt first used a planetary gear).
6. Step 6. Watt steam engine — has part — Boiler. The boiler supplies steam.

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